Swagling Benji

{u}{b}, {t}: Draw a card and lose 2 life, then add a Swag Counter to Swagling Benji
{b}{r}, {t}: Discard a card and deal 2 damage to target creature, then add a Swag Counter to Swagling Benji
At the begining of your upkeep if there are 3 or more Swag Counters on Swagling Benji exile Swagling Benji, then return him to the battlefield transformed under his owner's control.